A while back I blogged about an ICacheRepository. I still really like that concept, although admittedly there a few updates that I should make to the implementation.
The basic implementation that I shared before was for an in memory cache. There are plenty of document databases that I would recommend for you to use as a persistent cache mechanism, and they would also have the added benefit of being distributed across services.
What do you do if you need a persistent cache, but you don't have any of those document databases available? Just use files! By which I mean SQLite.
Would this stand up under load? Probably not.
Would I recommend that production systems use this? No.
Is it super simple to setup? Yes, yes it is!